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1 package org.ssdt_ohio.devel.forms.services;
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2
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3 import org.apache.tapestry5.SymbolConstants;
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4 import org.apache.tapestry5.ioc.MappedConfiguration;
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5 import org.apache.tapestry5.ioc.OrderedConfiguration;
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6 import org.apache.tapestry5.ioc.ServiceBinder;
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7 import org.apache.tapestry5.ioc.annotations.Local;
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8 import org.apache.tapestry5.services.Request;
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9 import org.apache.tapestry5.services.RequestFilter;
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10 import org.apache.tapestry5.services.RequestHandler;
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11 import org.apache.tapestry5.services.Response;
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12 import org.slf4j.Logger;
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13
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14 import java.io.IOException;
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15
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16 /**
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17 * This module is automatically included as part of the Tapestry IoC Registry, it's a good place to configure and extend
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18 * Tapestry, or to place your own service definitions.
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19 */
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20 public class AppModule {
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21 public static void bind(ServiceBinder binder) {
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22 // binder.bind(MyServiceInterface.class, MyServiceImpl.class);
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23
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24 // Make bind() calls on the binder object to define most IoC services.
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25 // Use service builder methods (example below) when the implementation
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26 // is provided inline, or requires more initialization than simply
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27 // invoking the constructor.
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28 }
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29
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30 public static void contributeFactoryDefaults(
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31 MappedConfiguration<String, Object> configuration) {
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32 // The application version number is incorprated into URLs for some
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33 // assets. Web browsers will cache assets because of the far future expires
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34 // header. If existing assets are changed, the version number should also
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35 // change, to force the browser to download new versions. This overrides Tapesty's default
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36 // (a random hexadecimal number), but may be further overriden by DevelopmentModule or
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37 // QaModule.
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38 configuration.override(SymbolConstants.APPLICATION_VERSION, "1.0-SNAPSHOT");
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39 }
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40
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41 public static void contributeApplicationDefaults(
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42 MappedConfiguration<String, Object> configuration) {
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43 // Contributions to ApplicationDefaults will override any contributions to
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44 // FactoryDefaults (with the same key). Here we're restricting the supported
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45 // locales to just "en" (English). As you add localised message catalogs and other assets,
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46 // you can extend this list of locales (it's a comma separated series of locale names;
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47 // the first locale name is the default when there's no reasonable match).
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48 configuration.add(SymbolConstants.SUPPORTED_LOCALES, "en");
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49
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50 // The factory default is true but during the early stages of an application
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51 // overriding to false is a good idea. In addition, this is often overridden
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52 // on the command line as -Dtapestry.production-mode=false
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53 configuration.add(SymbolConstants.PRODUCTION_MODE, false);
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54
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55 // The application version number is incorprated into URLs for some
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56 // assets. Web browsers will cache assets because of the far future expires
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57 // header. If existing assets are changed, the version number should also
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58 // change, to force the browser to download new versions.
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59 configuration.add(SymbolConstants.APPLICATION_VERSION, "1.0-SNAPSHOT-DEV");
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60 }
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61
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62
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63 /**
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64 * This is a service definition, the service will be named "TimingFilter". The interface, RequestFilter, is used
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65 * within the RequestHandler service pipeline, which is built from the RequestHandler service configuration.
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66 * Tapestry IoC is responsible for passing in an appropriate Logger instance. Requests for static resources are
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67 * handled at a higher level, so this filter will only be invoked for Tapestry related requests.
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68 * <p/>
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69 * <p/>
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70 * Service builder methods are useful when the implementation is inline as an inner class (as here) or require some
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71 * other kind of special initialization. In most cases, use the static bind() method instead.
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72 * <p/>
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73 * <p/>
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74 * If this method was named "build", then the service id would be taken from the service interface and would be
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75 * "RequestFilter". Since Tapestry already defines a service named "RequestFilter" we use an explicit service id
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76 * that we can reference inside the contribution method.
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77 */
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78 public RequestFilter buildTimingFilter(final Logger log) {
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79 return new RequestFilter() {
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80 public boolean service(Request request, Response response, RequestHandler handler)
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81 throws IOException {
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82 long startTime = System.currentTimeMillis();
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83
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84 try {
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85 // The responsibility of a filter is to invoke the corresponding method
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86 // in the handler. When you chain multiple filters together, each filter
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87 // received a handler that is a bridge to the next filter.
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88
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89 return handler.service(request, response);
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90 } finally {
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91 long elapsed = System.currentTimeMillis() - startTime;
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92
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93 log.info(String.format("Request time: %d ms", elapsed));
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94 }
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95 }
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96 };
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97 }
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98
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99 /**
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100 * This is a contribution to the RequestHandler service configuration. This is how we extend Tapestry using the
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101 * timing filter. A common use for this kind of filter is transaction management or security. The @Local annotation
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102 * selects the desired service by type, but only from the same module. Without @Local, there would be an error due
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103 * to the other service(s) that implement RequestFilter (defined in other modules).
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104 */
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105 public void contributeRequestHandler(OrderedConfiguration<RequestFilter> configuration,
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106 @Local
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107 RequestFilter filter) {
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108 // Each contribution to an ordered configuration has a name, When necessary, you may
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109 // set constraints to precisely control the invocation order of the contributed filter
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110 // within the pipeline.
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111
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112 configuration.add("Timing", filter);
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113 }
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114 }
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